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RAK13003 WisBlock IO Expansion Module Datasheet

Overview​

Description​

The RAK13003 is an IO expansion module that can be mounted to IO slot of WisBlock Base board. It offers 16 bidirectional I/O ports by using MCP23017 IC from Microchip. The configuration of the module is via I2C interface and it supports both standard and fast I2C modes.

Features​

  • 16-Bit Remote Bidirectional I/O Port
  • High-Speed I2C Interface
  • Configurable Interrupt Output Pins
  • INTA and INTB can be configured to operate independently or together
  • External Reset Input
  • Low Standby Current: 1 μA (max.)
  • Operating Voltage: 2.7 V to 5.5 V @ -40 °C to +85 °C
  • Chipset: Microchip MCP23017
  • Module size: 25X35 mm

Specifications​

Overview​

Mounting​

The RAK13003 module can be mounted on the IO slots of the WisBlock Base board. Figure 1 shows the mounting mechanism of the RAK13003 on a WisBlock Base board.

Figure 3015: RAK13003 WisBlock IO Expansion Module Mounting

Hardware​

The hardware specification is categorized into five parts. It shows the chipset of the module and discusses the pinouts and its corresponding functions and diagrams. It also covers the electrical and mechanical parameters that include the tabular data of the functionalities and standard values of the RAK13003 WisBlock IO Expansion Module.

Chipset​

The RAK13003 IO Expansion Module uses MCP23017 from Microchip.

VendorPart Number
MicrochipMCP23017

Figure 2 shows MCP23017 device addressing. Default A2, A1, and A0 are connected to ground. 7-Bits I2C address is 0x40.

Figure 3016: The MCP23017 device addressing

Pin Definition​

The RAK13003 WisBlock IO Expansion Module comprises a standard expansion. The expansion allows the RAK13003 module to be mounted on a WisBlock Base board. The pin order of the connector and the pinout definition is shown in Figure 3.

NOTE
  • I2C，SPI related pins, RESET，IO5，IO6，3V3, and GND are connected to this module.
  • IO5 and IO6 are connected to interrupt pin.
  • SPI not supported for RAK13003.
Figure 3017: RAK13003 WisBlock IO Expansion Module Pinout

Electrical Characteristics​

Recommended Operating Conditions​
SymbolDescriptionMin.Nom.Max.Unit
VDDPower supply for the module3.3V
IstbStandby current--1uA
IccSupply current--1.0mA

Mechanical Characteristic​

Board Dimensions​

Figure 4 shows the dimensions and the mechanic drawing of the RAK13003 module.

Figure 3018: RAK13003 WisBlock IO Expansion Module Mechanic Drawing
WisConnector PCB Layout​
Figure 3019: WisConnector PCB Footprint and Recommendations

Schematic Diagram​

I/O Expander​

Figure 6 shows RAK13003 WisBlock IO Expansion Module schematic diagram. Default uses 3V3_S for power supply.

Figure 3020: RAK13003 WisBlock IO Expansion Module Schematic
Device Address​

The Figure 7 shows device address bit2-bit0, default connected to ground.

Figure 3021: RAK13003 Device Address A2-A0